Piping Fabrication Procedure:
- Marking shall be done according to drawing
requirement and the same shall be checked by concerned supervisor prior to
cutting.
- The cutting shall be generally done as follows:
i. Carbon
Steel pipes - By gas cutting & grinding.
ii. Alloy
Steel pipes - By grinding or flammable cutting.
iii. Stainless
Steel Pipes - By grinding or plasma cutting.
- Before cutting the pipe Heat Number will be
transferred to the cut pieces by low stress dye stamping, Paint marking or
Tagging.
- End preparation and fit-up shall be done at
shop as per the approved Specification and WPS.
- Care shall be taken to make sure that
longitudinal seams on the joining pipes will not come in one line in a
butt joint. Seams will be staggered at least 100mm apart and also will
clear the branch connections. Care shall be taken to make sure that
longitudinal seams are not resting on the steel structure.
- Pipes
and Fittings for fit-up will be placed on temporary pipe bed and will make
sure that supports are secured properly.
- Welding of the joint will be done after getting QC fit-up Inspection clearance and the same shall be offered for Client inspection randomly.
- All flange connected to equipment shall be tack
welded only.
- Line
No, Component Heat No., Joint No., Fit-up inspection signature, Welder
No., Visual inspection signature and date of welding will be marked near
to the joint with metal paint marker.
- Spool
No. will be marked with paint marker and aluminum tag will be tied to the
spool. Fabrication completed spools will be shifted from shop to lay down
area.
- NDT shall be performed as required by Project specification. After NDT clearance, spools shall be released for erection
/ painting with release notice.
- NDT
rejected spools will be identified with yellow I black tag and the repair
will be done immediately and NDT will be executed on repaired weld areas
as required.
- After painting, field inspection shall be
offered for QC and the same shall be QC recorded in the prescribed
format.
- After painting inspection, the spool shall be
released for erection.
- Stainless Steel fabrication will be done in the
shop with an isolated area from carbon steel and alloy steel.
- No tools, tackles, equipment will be used for
SS which has been used for CS. All tools and equipment dedicated to SS
work shall be clearly marked "For Stainless Steel" only.
- For Stainless steel materials, stainless steels
tools will be used for grinding, brushing and clamping etc.
- Pre
heating and PWHT will be done at shop and field as per specification
requirements.
- All flanged raised faces of completed spools will be fitted with plywood blinds for protection and spool ends shall be fitted with proper caps
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ReplyDeleteThe pipe fabrication process involves precise steps like marking, cutting, and fit-up inspections to ensure quality. Stainless Steel work is strictly segregated from carbon and alloy steels to prevent contamination. Each joint undergoes rigorous QC checks and NDT before being released for erection, with dedicated tools for Stainless Steel to avoid cross-contamination, crucial for pipe fabrication projects.
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